Donald and Ronald Are Identical Twins Who Have Been Raised

question 21

Multiple Choice

Donald and Ronald are identical twins who have been raised apart, in separate adoptive homes. However, both brothers have developed the same psychological disorder. This information could be used as evidence to suggest that ​

• A)environmental factors have more influence than genetic factors in this disorder.
• B)both genetic and environmental factors contribute equally to this disorder.
• C)genetic factors have more influence than environmental factors in this disorder.
• D)neither genetic nor environmental factors contribute to this disorder.

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